An introduction to the medical endoscope

Endoscope is a common medical instrument. It is composed of a flexible part, a light source and a group of lenses. It enters the body through a natural orifice, or through a small surgical incision. When used, the endoscope is introduced into the pre-examined organ, and the changes of the relevant parts can be directly seen. The quality of the image directly affects the use effect of endoscope, and also marks the development level of endoscope technology. The earliest use of endoscopes was in rectal examination. The doctor inserted a hard tube into the patient's anus and, with the light of a candle, observed the lesions in the rectum. The diagnostic data available with this method are limited, and the patient is not only in pain, but there is a great risk of perforation due to the hardness of the instrument. Despite these drawbacks, endoscopy has continued to be used and developed, with many different applications and different types of instruments gradually being designed.

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